Journal Highlight: Acceleration and motion-correction techniques for high-resolution intravascular MRI

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  • Published: Sep 21, 2015
  • Author: spectroscopyNOW
  • Channels: MRI Spectroscopy
thumbnail image: Journal Highlight: Acceleration and motion-correction techniques for high-resolution intravascular MRI
Compressed sensing reconstruction and ungated motion-compensation using projection shifting have been tested to see if they provide faster motion-suppressed intravascular MRI operation.

Acceleration and motion-correction techniques for high-resolution intravascular MRI

Magnetic Resonance in Medicine, 2015, 74, 452-461
Shashank Sathyanarayana Hegde, Yi Zhang and Paul A. Bottomley

Abstract: High-resolution intravascular (IV) MRI is susceptible to degradation from physiological motion and requires high frame-rates for true endoscopy. Traditional cardiac-gating techniques compromise efficiency by reducing the effective scan rate. Here we test whether compressed sensing (CS) reconstruction and ungated motion-compensation using projection shifting, could provide faster motion-suppressed, IVMRI. CS reconstruction is developed for undersampled Cartesian and radial imaging using a new IVMRI-specific cost function to effectively increase imaging speed. A new motion correction method is presented wherein individual IVMRI projections are shifted based on the IVMRI detector's intrinsic amplitude and phase properties. The methods are tested at 3 Tesla (T) in fruit, human vessel specimens, and a rabbit aorta in vivo. Images are compared using structural-similarity and "spokal variation" indices. Although some residual artifacts persisted, CS acceleration and radial motion compensation strategies reduced motion artifact in vitro and in vivo, allowing effective accelerations of up to eight-fold at 200–300 µm resolution. The 3T IVMRI detectors are well-suited to CS and motion correction strategies based on their intrinsic radially-sparse sensitivity profiles and high signal-to-noise ratios. While benefits of faster free-breathing high-resolution IVMRI and reduced motion sensitivity are realized, there are costs to spatial resolution, and some motion artifacts may persist.

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